Someone

public aspect Tester
{
    Logger _log = Logger.getLogger(Tester.class.getName());
    AtomicInteger spawnCounter = new AtomicInteger(0);
    
    pointcut callsSpawn(): 
        target(L2Spawn) && 
        (call(L2NpcInstance doSpawn()));
    
    before(): callsSpawn()
    {
        int value = spawnCounter.incrementAndGet();
        _log.info("Spawn is created. Count: "+value);
    }
}